CVE-2026-46299

Kernel memory corruption via unreleased HFS+ tree lock

Published Jun 8, 2026 · Updated Jun 8, 2026

Improper locking in the Linux Kernel HFS+ filesystem allows local users with CAP_SYS_ADMIN to trigger a held-lock-free condition during mounting. In hfsplus_fill_super(), failure of hfsplus_cat_build_key() bypasses hfs_find_exit(), leaving tree->tree_lock held when cleanup frees the search tree. Reachability requires HFS+ support and a key-building failure; published validation forced that failure with GDB, so no practical attacker-controlled trigger is demonstrated.

CVSS severity7.0
High
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux Kernel HFS+ filesystem allows local users with CAP_SYS_ADMIN to trigger a held-lock-free condition during mounting. In hfsplus_fill_super(), failure of hfsplus_cat_build_key() bypasses hfs_find_exit(), leaving tree->tree_lock held when cleanup frees the search tree. Reachability requires HFS+ support and a key-building failure; published validation forced that failure with GDB, so no practical attacker-controlled trigger is demonstrated.

The record

CVE
CVE-2026-46299
Published
Jun 8, 2026
Updated
Jun 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.19
  2. Affected versionversion=89ac9b4d3d1a049ae1054f99b1aed81092cd0a82 <041acda6d9f96006703466449c10c9a69590c8b9
  3. Affected versionversion=89ac9b4d3d1a049ae1054f99b1aed81092cd0a82 <3ca80e3012c8be85b4f8d0d20eac8d3b17ff257e
  4. Affected versionversion=89ac9b4d3d1a049ae1054f99b1aed81092cd0a82 <90c500e4fd83fa33c09bc7ee23b6d9cc487ac733
  5. Affected versionversion=89ac9b4d3d1a049ae1054f99b1aed81092cd0a82 <bfbcce6a7b0552a390620d9b2c4d2bcb1825cbdc
  6. Affected versionversion=89ac9b4d3d1a049ae1054f99b1aed81092cd0a82 <d309d3308de658d87c42d97e044c89a226327526

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.19; version=89ac9b4d3d1a049ae1054f99b1aed81092cd0a82 <041acda6d9f96006703466449c10c9a69590c8b9; version=89ac9b4d3d1a049ae1054f99b1aed81092cd0a82 <3ca80e3012c8be85b4f8d0d20eac8d3b17ff257e; version=89ac9b4d3d1a049ae1054f99b1aed81092cd0a82 <90c500e4fd83fa33c09bc7ee23b6d9cc487ac733; version=89ac9b4d3d1a049ae1054f99b1aed81092cd0a82 <bfbcce6a7b0552a390620d9b2c4d2bcb1825cbdc; version=89ac9b4d3d1a049ae1054f99b1aed81092cd0a82 <d309d3308de658d87c42d97e044c89a226327526

Published CVSS scores

7.0Linux kernel CVE teamCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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